London Mayor Sadiq Khan on Saturday was beginning a speech on gender equality to the Fabian Society — a democratic socialist think tank — when right-wing protesters stood from the crowd and said they had arrived to “make a non-violent, peaceful citizen’s arrest.”

The demonstrators — part of a group calling itself the White Pendragons — reportedly held up American flags and chanted pro-Brexit slogans, seemingly in protest of comments Khan made Friday in response to President Donald Trump’s racist complaint about immigrants from “shithole countries” like Haiti and in Africa.

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London's newly elected mayor Sadiq Khan appears on the BBC's Andrew Marr Show programe in a studio in London, Britain, May 8, 2016. REUTERS/Jeff Overs/Handout via Reuters ATTENTION EDITORS - FOR EDITORIAL USE ONLY. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. NO ARCHIVES. NO RESALES.

Sadiq Khan attends the signing ceremony for the newly elected Mayor of London, in Southwark Cathedral, London, Britain, May 7, 2016. REUTERS/Yui Mok/Pool

LONDON, ENGLAND - MAY 09: London Mayor Sadiq Khan makes his way to work after leaving his home in Tooting on May 9, 2016 in London, England. Mr Khan begins his first day at his City Hall office after winning the race to become London's Mayor with 56.8% of the vote. (Photo by Jack Taylor/Getty Images)

Britain's newly elected mayor Sadiq Khan is embraced by a supporter as he arrives for his first day at work at City Hall in London, Britain May 9, 2016. REUTERS/Hannah McKay

Britain's newly elected mayor Sadiq Khan arrives for his first day at work at City Hall in London, Britain May 9, 2016. REUTERS/Hannah McKay

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Trump on Friday canceled his upcoming trip to the United Kingdom, citing his dissatisfaction with the relocation of the United States embassy, which he incorrectly attributed to former President Barack Obama.

Khan said in a statement Friday that Londoners love the U.S., but find his “policies and actions the polar opposite of our city’s values of inclusion, diversity and tolerance” and that his February visit would have been “met by mass peaceful protest.”

Many Londoners have made it clear that Donald Trump is not welcome here while he is pursuing such a divisive agenda. It seems he’s finally got that message. pic.twitter.com/YD0ZHuWtr3

“Many Londoners have made it clear that Donald Trump is not welcome here while he is pursuing such a divisive agenda,” Khan tweeted. “It seems he’s finally got that message.”

The protesters Saturday disrupted the address for several minutes before being removed by police. Outside the venue, members of the White Pendragons told reporters that they believed the Fabians were “subverting society” and that Khan, who is Muslim, “has no right to be Mayor of London, referencing his religion,” according to reporter Paul Brand.

They claim they are not a racist group, nor far right. But they told us Sadiq Khan has no right to be Mayor of London, referencing his religion.

“It is a pleasure to be here even though we were distracted by the actions of what some would call very stable geniuses,” Khan said when he restarted his speech, referencing Trump’s bizarre defense of his mental stability and intellect last week.

“I don’t think we should roll out the red carpet to the president of the USA in the circumstances where his policies go against everything we stand for,” Khan said at the time. “When you have a special relationship it is no different from when you have got a close mate. You stand with them in times of adversity but you call them out when they are wrong. There are many things about which Donald Trump is wrong.”